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1 /* PR tree-optimization/83698 - bogus offset in -Wrestrict messages for
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2 strcat of unknown strings
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3 { dg-do compile }
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4 { dg-options "-O2 -Wrestrict -ftrack-macro-expansion=0" } */
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5
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6 extern char* strcat (char*, const char*);
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7
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8 void sink (char*);
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9
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10 #define T(d, s) sink (strcat (d, s))
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11
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12 extern char arr[];
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13
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14
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15 void test_strcat_array_cst_offset (void)
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16 {
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17 T (arr, arr + 1); /* { dg-warning "accessing 2 or more bytes at offsets 0 and 1 may overlap 1 byte at offset 1" } */
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18 T (arr, arr + 2); /* { dg-warning "accessing 3 or more bytes at offsets 0 and 2 may overlap 1 byte at offset 2" } */
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19 T (arr, arr + 13); /* { dg-warning "accessing 14 or more bytes at offsets 0 and 13 may overlap 1 byte at offset 13" } */
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20
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21 T (arr + 1, arr); /* { dg-warning "accessing 2 or more bytes at offsets 1 and 0 may overlap 1 byte at offset 1" } */
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22 T (arr + 17, arr + 11); /* { dg-warning "accessing 7 or more bytes at offsets 17 and 11 may overlap 1 byte at offset 17" } */
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23 T (arr + 36, arr + 20); /* { dg-warning "accessing 17 or more bytes at offsets 36 and 20 may overlap 1 byte at offset 36" } */
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24 }
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25
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26 void test_strcat_ptr_cst_offset (char *d)
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27 {
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28 T (d - 12, d + 34); /* { dg-warning "accessing 47 or more bytes at offsets -12 and 34 may overlap 1 byte at offset 34" } */
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29 T (d + 12, d + 34); /* { dg-warning "accessing 23 or more bytes at offsets 12 and 34 may overlap 1 byte at offset 34" } */
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30 T (d + 20, d + 36); /* { dg-warning "accessing 17 or more bytes at offsets 20 and 36 may overlap 1 byte at offset 36" } */
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31 }
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32
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33 void test_strcat_array_var_offset (int i, int j)
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34 {
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35 T (arr + i, arr); /* { dg-warning "accessing 1 or more bytes at offsets \\\[0, \[0-9\]+] and 0 may overlap 1 byte at offset \\\[0, \[0-9\]+]" } */
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36 T (arr, arr + j); /* { dg-warning "accessing 1 or more bytes at offsets 0 and \\\[0, \[0-9\]+] may overlap 1 byte at offset \\\[0, \[0-9\]+]" } */
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37 T (arr + i, arr + j); /* { dg-warning "accessing 1 or more bytes at offsets \\\[0, \[0-9\]+] and \\\[0, \[0-9\]+] may overlap 1 byte at offset \\\[0, \[0-9\]+]" } */
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38
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39 T (arr + i, arr + 5); /* { dg-warning "accessing 6 or more bytes at offsets \\\[0, \[0-9\]+] and 5 may overlap 1 byte at offset \\\[5, \[0-9\]+]" } */
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40 T (arr + 7, arr + j); /* { dg-warning "accessing 8 or more bytes at offsets 7 and \\\[0, \[0-9\]+] may overlap 1 byte at offset \\\[7, \[0-9\]+]" } */
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41 }
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42
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43 void test_strcat_ptr_var_offset (char *d, int i, int j)
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44 {
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45 T (d + i, d); /* { dg-warning "accessing \[0-9\]+ or more bytes at offsets \\\[-\[0-9\]+, \[0-9\]+] and 0 may overlap 1 byte at offset \\\[0, \[0-9\]+]" } */
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46 T (d, d + j); /* { dg-warning "accessing \[0-9\]+ or more bytes at offsets 0 and \\\[-\[0-9\]+, \[0-9\]+] may overlap 1 byte at offset \\\[0, \[0-9\]+]" } */
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47 T (d + i, d + j); /* { dg-warning "accessing 1 or more bytes at offsets \\\[-\[0-9\]+, \[0-9\]+] and \\\[-\[0-9\]+, \[0-9\]+] may overlap 1 byte at offset \\\[-\[0-9\]+, \[0-9\]+]" } */
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48
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49 T (d + i, d + 3); /* { dg-warning "accessing \[0-9\]+ or more bytes at offsets \\\[-\[0-9\]+, \[0-9\]+] and 3 may overlap 1 byte at offset \\\[3, \[0-9\]+]" } */
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50 T (d + 9, d + j); /* { dg-warning "accessing \[0-9\]+ or more bytes at offsets 9 and \\\[-\[0-9\]+, \[0-9\]+] may overlap 1 byte at offset \\\[9, \[0-9\]+]" } */
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51 }
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